/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.sentry.provider.common;

import java.util.Set;
import javax.annotation.concurrent.ThreadSafe;

import org.apache.sentry.core.common.exception.SentryGroupNotFoundException;

/**
 * Interface so the Groups class is easier to unit test with.
 * Implementations of this class are expected to be thread safe
 * after construction.
 */
@ThreadSafe
public interface GroupMappingService {

  /**
   * @return non-null list of groups for user
   */
  Set<String> getGroups(String user) throws SentryGroupNotFoundException;
}
